Choosing the right real estate agent to negotiate on your behalf is essential. You should obtain advice from at least three agents. Don’t be seduced by a high price estimate. The agent must provide you with recent sales statistics for comparable properties in your area to show how they arrived at their selling price estimate.
Real estate agents, sales representatives and auctioneers must be registered and carry a photographic registration card. You can check whether the land agent or the company is registered at the CBS Licensing Public Register.
If you discover that an agent or sales representative is not registered please inform Consumer and Business Services on 131 882.
Source: http://www.cbs.sa.gov.au/wcm/consumers/consumer-advice/buying-or-selling-a-home/selling/